diff --git a/hetzner.yaml b/hetzner.yaml
index 6b68e2b..6d61b1d 100644
--- a/hetzner.yaml
+++ b/hetzner.yaml
@@ -69,6 +69,7 @@
         - name: Inform Mattermost about success
           uri:
             url: "{{ mattermost_url }}"
+            validate_certs: no
             method: POST
             body_format: json
             body:
@@ -83,6 +84,7 @@
         - name: Inform Mattermost about error
           uri:
             url: "{{ mattermost_url }}"
+            validate_certs: no
             method: POST
             body_format: json
             body: